1 files changed, 39 insertions, 0 deletions
diff --git a/src/features/chat/reasoning-effort.test.ts b/src/features/chat/reasoning-effort.test.ts
index 6d409e9..e870bac 100644
--- a/src/features/chat/reasoning-effort.test.ts
+++ b/src/features/chat/reasoning-effort.test.ts
@@ -2,9 +2,12 @@ import { describe, expect, it } from "vitest";
 import {
   DEFAULT_REASONING_EFFORT,
   effectiveEffort,
+  effectiveSelection,
   effortOptions,
   isReasoningEffort,
+  isThinkingSelection,
   REASONING_EFFORT_LEVELS,
+  selectionOptions,
 } from "./reasoning-effort";
 
 describe("reasoning-effort helpers", () => {
@@ -43,3 +46,39 @@ describe("reasoning-effort helpers", () => {
     }
   });
 });
+
+describe("thinking selection (the separate on/off axis)", () => {
+  it("selectionOptions lists 'off' first, then the ladder (default marked)", () => {
+    const options = selectionOptions();
+    expect(options).toHaveLength(1 + REASONING_EFFORT_LEVELS.length);
+    expect(options[0]?.value).toBe("off");
+    expect(options[0]?.label).toBe("Off");
+    // the rest are the ladder, unchanged from effortOptions()
+    expect(options.slice(1).map((o) => o.value)).toEqual([...REASONING_EFFORT_LEVELS]);
+    expect(options.find((o) => o.value === "high")?.label).toBe("high (default)");
+  });
+
+  it("isThinkingSelection narrows 'off' + ladder strings, rejects the rest", () => {
+    expect(isThinkingSelection("off")).toBe(true);
+    for (const level of REASONING_EFFORT_LEVELS) {
+      expect(isThinkingSelection(level)).toBe(true);
+    }
+    expect(isThinkingSelection("banana")).toBe(false);
+    expect(isThinkingSelection("")).toBe(false);
+    expect(isThinkingSelection("OFF")).toBe(false);
+    expect(isThinkingSelection("none")).toBe(false); // NOT a wire value we send
+  });
+
+  it("effectiveSelection shows 'off' when thinking is explicitly disabled", () => {
+    // thinking off is a SEPARATE axis: the effort level is irrelevant while off.
+    expect(effectiveSelection("xhigh", false)).toBe("off");
+    expect(effectiveSelection(null, false)).toBe("off");
+  });
+
+  it("effectiveSelection shows the effort level when thinking is on (default)", () => {
+    // null thinking = never set ⇒ thinking ON (default) ⇒ show the effort level.
+    expect(effectiveSelection(null, null)).toBe("high"); // default effort
+    expect(effectiveSelection("low", null)).toBe("low");
+    expect(effectiveSelection("max", true)).toBe("max"); // explicitly on
+  });
+});